Creates new user accounts using data read from standard input.
The input data consists of lines, each line has 7 colon-separated fields:
User name
Plaintext password
User ID
lnewusers refuses to create users with user ID 0 (the root user ID).
Group If this field is a valid group ID, it is interpreted as a group ID, otherwise as a group name. If the field is empty, a group name
equal to user name is used.
If the specified group does not exist, it is automatically created. If the group is specified with a group ID, the created group
has group name equal to the user name.
GECOS The GECOS field is traditionally used to store user's real name and other information.
Home directory
If this field is empty, a default specified by libuser configuration, or /home/username if libuser configuration does not specify a
default, is used.
Login shell
If this field is empty, a default specified by libuser configuration is used.
Errors in user specifications are reported and processing continues on the next line.